﻿// Copyright (c) 2014 AlphaSierraPapa for the SharpDevelop Team
// 
// Permission is hereby granted, free of charge, to any person obtaining a copy of this
// software and associated documentation files (the "Software"), to deal in the Software
// without restriction, including without limitation the rights to use, copy, modify, merge,
// publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons
// to whom the Software is furnished to do so, subject to the following conditions:
// 
// The above copyright notice and this permission notice shall be included in all copies or
// substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED,
// INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
// PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE
// FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
// DEALINGS IN THE SOFTWARE.

using System;
using System.Windows;

namespace ICSharpCode.Core.Presentation
{
	public sealed class LanguageChangeWeakEventManager : WeakEventManager
	{
		/// <summary>
		/// Adds a weak event listener.
		/// </summary>
		public static void AddListener(IWeakEventListener listener)
		{
			CurrentManager.ProtectedAddListener(null, listener);
		}
		
		/// <summary>
		/// Removes a weak event listener.
		/// </summary>
		public static void RemoveListener(IWeakEventListener listener)
		{
			CurrentManager.ProtectedRemoveListener(null, listener);
		}
		
		/// <summary>
		/// Gets the current manager.
		/// </summary>
		[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1721:PropertyNamesShouldNotMatchGetMethods")]
		private static LanguageChangeWeakEventManager CurrentManager {
			get {
				LanguageChangeWeakEventManager manager = (LanguageChangeWeakEventManager)GetCurrentManager(typeof(LanguageChangeWeakEventManager));
				if (manager == null) {
					manager = new LanguageChangeWeakEventManager();
					SetCurrentManager(typeof(LanguageChangeWeakEventManager), manager);
				}
				return manager;
			}
		}
		
		readonly IResourceService resourceService = ServiceSingleton.GetRequiredService<IResourceService>();
		
		protected override void StartListening(object source)
		{
			resourceService.LanguageChanged += DeliverEvent;
		}
		
		protected override void StopListening(object source)
		{
			resourceService.LanguageChanged -= DeliverEvent;
		}
	}
}
